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Missouri Public Service CommissionSmart Grid Technical Conference
IEC 61850
Burns & McDonnell Transmission and Distribution
Chad StilwellTelecommunications and Network Engineering
November 29th, 2011
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Smart Grid Communication
• Today we monitor:– Power plants– Transmission lines– Transmission substations
• Provides limited distribution feeder information.• Smart Grid requires communication to extend
further into grid:– Multiple locations on distribution feeder – Customer premise
• One solution may not work for entire service territory
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IEC 61850 High Level Overview
• Information is described in a common way across all devices
• All information is available to all devices • Information is shared in real time over a
common communications bus
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IEC 61850 High Level Overview
• Common Information Model (CIM) • Substation Configuration Language (SCL)• Object oriented communications protocols
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Common Information Model
• No longer vendor specific method for representing data in registers
• Common way of describing data and quality of the information
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IEC 61850 Objects
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GOOSE
• Event coordination protocol• One way – devices advertise know
information• Any other devise subscribes to channel• Unconfirmed• Status updates sent when event occurs• User defined data in each message• LEAN and FAST (tripping)
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Manufacture Message Specification (MMS)
• Metering/Status/Control protocol• Object oriented standardized information
per device type • Time stamp and quality information with
each object• Polled or report by exception • Derivative of UCA
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Sampled Values (SV)
• Process Bus• Real-time transfer of currents and voltages• Same transport model as GOOSE• Constant period between messages • 80 to 256 samples per second
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Common Information Model
• IED Capability Description (ICD)• Configured IED Description (CID)• Substation Configuration Description (SCD)
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System Configuration Language (SCL)
• Data architecture– Station one-line – Control logic– Communication – Settings come directly from model (ICD)– XML based
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System Configuration Language (SCL)
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Object Oriented Protocols
• Object Oriented Substation Event (GOOSE)
• Manufacture Message Specification (MMS)
• Sampled Values (SV)
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IEC 61850 = More Documentation?
• Substation configuration tool– Electronic model of substation – Validation / what if scenarios
• Decrease wiring/elementary/schematic diagrams
• Net decrease in manually created documentation
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IEC 61850 and Security
• Within control house -> CIP compliance methods are well established
• In the substation yard -> It is possible but not as well tested by audits– The NERC interpretation to PacifiCorp in
February 2009,approved by FERC (Docket No. RM06-22-000) on April 20, 2010 outlines some clarifications to “six sided” physical security for critical cyber assets.
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IEC 61850 and Security
• Clarifies that alternative measures to "control" physical access may comprise both physical as well as logical measures.
• Acceptable alternative nonphysical control measures may include, for example, data encryption for protection and circuit monitoring for detection of unauthorized physical access or tampering.
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Vendor Interoperability
• It is getting better • GOOSE and MMS messaging are
interoperable • Configuration methods are not – vendors
support the standard to varying degrees• New generation of devices have IEC
61850 built into hardware architecture from the start
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On-going 61850 Development
• IEC 61850-90-1– Extensions to IEC-61850 to address inter-
substation communication on WAN– IEEE 1588v2 Precision Time Protocol (PTP)
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IEC 61850 – Additional Developments
• Power Quality• Weather Forecasting Data• Hydroelectric Power Plants• Wind Generation (61400-25)• High Voltage Switchgear (62271-3)• Distributed Energy Management